Tā kào chāidōngqiángbǔxīqiáng lái wéichí jiālǐ de kāizhī.
He keeps household spending afloat by robbing Peter to pay Paul.
Tips
memory
The image is vivid: a crumbling courtyard where you demolish 东墙 (east wall) just to plug the gap in 西墙 (west wall) - you end up with the same number of holes.
usage
Strongly disapproving, typically about finances or resource management. Very common in everyday speech, one of the most useful 'saying' idioms.